How to kill a tree?

In <4faqr8$le4 at newsserver.rrzn.uni-hannover.de> Studenten Fachbereich
Gartenbau <gast at ifgb.uni-hannover> writes:
>>You have to make a small hole with a scriver into the stem near the
roots
>and fill in oil or gasolina ( about 0,5 liters )
>No no.........just ring the bark around the trunk about 1 inch gap down
to the solid wood. Trees hate me, one almost killed me, but the mind
usually wins!